Dark face may be related to cirrhosis, and may also be related to acanthosis nigricans, solar radiation and other reasons, according to the specific circumstances of rational analysis. 1. Cirrhosis: the role of the liver is mainly detoxification, hormone inactivation, due to cirrhosis into the loss of compensatory phase, the inactivation of estrogen obstacles, so that the body of estrogen increases, more than that makes the skin black. Cirrhosis caused by darkening of the face, must seek medical treatment in time, symptomatic treatment. 2. Acanthosis nigricans: it is due to heredity, endocrine disorders caused by skin melanin deposition, black plaques, and closely related to tumor diseases. Melanin is mainly distributed in the face, neck and around the abdomen. If you find such a situation on your skin, you should go to the hospital immediately for treatment. 3. Sunlight irradiation: If the skin is exposed to sunlight, ultraviolet rays stimulate the pigment cells under the skin, affecting the normal metabolic function of the cells, which will produce a large amount of melanin, making it impossible for the melanin to be discharged and remain on the skin, resulting in darkening of the face. Do a good job of sun protection in normal life, pay attention to shade. There are many reasons affecting the darkening of the face, which should be analyzed on a case-by-case basis, and if other symptoms appear, you should go to the hospital in time.